When an asteroid heads for Earth, it’s time to reconsider those doomsday plans

By Alexandra Witze, 09:22 AM March 7, 2013

Chicken Little is right. The sky is falling.

The million-plus people living in Chelyabinsk, Russia, got that message on February 15, when a space rock some 17 meters across detonated over their homes. People rushed to the windows in wonderment as a blaze of light arced through the sky; seconds later many of them got a face full of glass shards. It was the most damaging cosmic collision since 1908, when an even bigger asteroid chunk blew up over Siberia. (In an era before YouTube and dashboa...

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